[Fzang]

I have this weird problem that goes:

"Structural analysis has proven that IF6- is not octahedral. Account for this result"

I'm kind of lost. If it's not octahedral, what then?

EDIT: Okay, so it has a lonepair, on top of the octahedral configuration with fluoride. So it's gotta be some distorted version of the octahedral, because the lone pair is budging around here and there?

[Schrödinger]

http://en.wikipedia.org/wiki/Xenon_hexafluoride
Read under "Structure"

In the IF6- ion, the negative charge is borne by the Iodine atom. Since the electronic configuration of I- is the same as that of Xe, I think their structures will similar.

[BluePill]

hint: it's a C_5v molecule.